Re: [Qemu-devel] [PATCH v4] XBZRLE delta for live migration of large memory apps
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On 08/08/2011 05:04 PM, Daniel P. Berrange wrote:
My main concern with all these scenarios where libvirt touches the actual data stream though is that we're introducing extra data copies into the migration path which potentially waste CPU cycles. If QEMU can directly XBZRLE encode data into the FD passed via 'fd:' then we minimize data copies. Whether this is a big enough benefit to offset the burden of having to maintain various compression code options in QEMU I can't answer.
It's counterproductive to force an unneeded data copy in order to increase bandwidth.
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